CN217298210U

CN217298210U - Feed dog lifting mechanism and sewing machine

Info

Publication number: CN217298210U
Application number: CN202221329283.0U
Authority: CN
Inventors: 叶梦启; 阮来宾; 陈仕海
Original assignee: Precious Science And Technology Group Corp ltd
Current assignee: Precious Science And Technology Group Corp ltd
Priority date: 2022-05-27
Filing date: 2022-05-27
Publication date: 2022-08-26
Anticipated expiration: 2032-05-27

Abstract

The utility model belongs to the technical field of sewing equipment, in particular to a feed dog lifting mechanism and a sewing machine; the cloth feeding tooth lifting mechanism comprises a shell, a pressure lifting foot lever and an eccentric shaft, wherein the pressure lifting foot lever and the eccentric shaft are rotatably arranged on the shell, the eccentric shaft is rotatably arranged in the shell, the inner end of the eccentric shaft is connected with a differential tooth rack and a tooth rack assembly, differential teeth are arranged on the differential tooth rack, a tooth assembly is arranged on the tooth rack assembly, an eccentric shaft connecting rod is arranged at the outer end of the eccentric shaft, the eccentric shaft connecting rod is driven by the pressure lifting foot lever to rotate to drive the eccentric shaft to rotate to drive the differential teeth and the tooth assembly to descend, and the eccentric shaft connecting rod is driven by a reset mechanism to reset to drive the differential teeth and the tooth assembly to reset; the utility model discloses with lift presser foot mechanism cooperation, when the presser foot function is lifted in the use, realize that differential tooth and tooth subassembly descend to faller horizontal position, put the space grow of cloth before sewing next time, be convenient for put the cloth, the condition that appears the cloth and bump the feed dog when avoiding putting the cloth causes the certain damage of cloth.

Description

Feed dog lifting mechanism and sewing machine

The technical field is as follows:

the utility model belongs to the technical field of sewing equipment, refer in particular to a feed dog elevating system and sewing machine.

Background art:

a sewing machine is a machine that uses one or more sewing threads to form one or more stitches in a material to be sewn, thereby interweaving or stitching one or more layers of material.

When the sewing machine is stopped, the presser foot is usually lifted, and at the moment, the feed dog is at the highest position. At this time, the cloth is put between the presser foot and the needle plate for next sewing. Because the feed dog is higher than the needle plate, the space for placing the cloth is small, and the condition that the feed dog touches the cloth can occur when the cloth is placed, so that the cloth is damaged to a certain extent.

The invention content is as follows:

the utility model aims at providing a can drive feed dog decline when lifting the presser foot, be convenient for put feed dog elevating system and sewing machine of cloth.

The utility model discloses a realize like this:

one of the purposes of the utility model is to provide a feed dog elevating system, install lifting presser foot lever, eccentric shaft on the casing including casing, rotation, the eccentric shaft rotates and sets up in the casing, and the inner and differential tooth dental articulator, dental articulator subassembly of eccentric shaft are connected, be provided with differential tooth on the differential tooth dental articulator, be provided with the tooth subassembly on the dental articulator subassembly the outer end of eccentric shaft is provided with the eccentric shaft connecting rod, the eccentric shaft connecting rod rotates by lifting presser foot lever drive and drives the eccentric shaft rotation and drive differential tooth, tooth subassembly and descend, the eccentric shaft connecting rod is reset by the canceling release mechanical system drive and is driven differential tooth, tooth subassembly and reset.

In the feed dog lifting mechanism, the outer end of the eccentric shaft is provided with a projection, the eccentric shaft connecting rod is provided with a through hole matched with the projection, the projection is arranged in the through hole, and an axial position screw is arranged on the outer end surface of the projection to axially limit the eccentric shaft connecting rod.

In the above feed dog lifting mechanism, the protrusion is a D-shaped protrusion, a track-shaped protrusion, or a polygonal protrusion, and the through hole is a D-shaped hole, a track-shaped hole, or a polygonal hole.

In the above feed dog lifting mechanism, the reset mechanism includes a reset torsion spring sleeved on the rod portion of the shaft position screw and a limit screw located on one side of the shaft position screw, the limit screw is screwed on the casing, a rotating arm at one end of the reset torsion spring abuts against the limit screw, and the other end of the reset torsion spring abuts against the side wall of the eccentric shaft connecting rod.

In the above feed dog lifting mechanism, the outer end of the eccentric shaft is sleeved with a limiting plate, an arc hole is formed in the limiting plate, a limiting screw penetrates through the arc hole and is screwed on the machine shell, and a propping part is arranged on the limiting plate and opposite to the limiting screw.

In the above-described feed dog lifting mechanism, the rotation of the presser foot lever is controlled by an actuator or a foot pedal.

In the above feed dog lifting mechanism, the driver is an electromagnet, a motor or an air cylinder.

Another object of the present invention is to provide a sewing machine, comprising the above feed dog lifting mechanism.

Compared with the prior art, the utility model outstanding advantage is:

1. the utility model is matched with the presser foot lifting mechanism, and utilizes the presser foot lifting lever of the presser foot lifting mechanism to realize that the differential teeth and the tooth components descend to the horizontal position of the needle plate when the presser foot lifting function is used, so that the space for placing cloth before the next sewing is enlarged, which is convenient for placing cloth, and simultaneously, the condition that the cloth collides with the feed dog because the feed dog is higher than the horizontal position of the needle plate can be avoided, especially in some special cloth, certain damage of the cloth can be caused because of the collision with the feed dog;

2. the utility model discloses the limiting plate that sets up can adjust the height that the feed dog exposes the faller to be applicable to the occasion of making up of different cloth.

Description of the drawings:

fig. 1 is an exploded schematic view of the present invention;

fig. 2 is a perspective view of the present invention;

fig. 3 is a schematic diagram of the present invention after the casing is disassembled;

fig. 4 is a schematic view of the eccentric shaft connecting rod in the initial state of the present invention.

In the figure: 1. a housing; 2. lifting a presser foot lever; 3. an eccentric shaft; 4. a slider; 5. a differential tooth rack; 6. A dental articulator assembly; 7. differential teeth; 8. a dental component; 9. an eccentric shaft connecting rod; 10. a bump; 11. a through hole; 12. an axial screw; 13. a return torsion spring; 14. a limit screw; 15. a limiting plate; 16. an arc-shaped hole; 17. An abutting portion.

The specific implementation mode is as follows:

the invention will now be further described with reference to specific embodiments, and with reference to figures 1 to 4:

the utility model discloses one of them purpose provides a feed dog elevating system, this feed dog elevating system include casing 1, rotate and install pressure foot lever 2, eccentric shaft 3 of lifting on casing 1, eccentric shaft 3 rotates and sets up in casing 1, and the inner of eccentric shaft 3 is connected with differential tooth dental articulator 5, dental articulator subassembly 6 through slider 4, be provided with differential tooth 7 on the differential tooth dental articulator 5, be provided with tooth subassembly 8 on the dental articulator subassembly 6 the outer end of eccentric shaft 3 is provided with eccentric shaft connecting rod 9, eccentric shaft connecting rod 9 is rotated by lifting pressure foot lever 2 drive and is driven eccentric shaft 3 rotation and drive differential tooth 7, the decline of tooth subassembly 8, eccentric shaft connecting rod 9 is reset by the canceling release mechanical drive and is driven differential tooth 7, the tooth subassembly 8 and reset.

Further, the pressure raising and pressing foot lever 2 is controlled to rotate by a driver or a foot pedal, wherein the driver is an electromagnet or a motor or an air cylinder. The utility model discloses when lifting the presser foot, drive differential tooth 7, tooth subassembly 8 and descend to faller horizontal position, before carrying out next sewing work, the cloth is convenient for put to the space grow (the space grow of putting the cloth) between presser foot and the faller, prevents that the cloth from touchhing cloth feed dog (differential tooth 7, tooth subassembly 8), causes certain damage to the cloth.

Specifically, the eccentric shaft connecting rod 9 drives the eccentric shaft 3 to rotate, and the specific connection structure is as follows: the outer end of the eccentric shaft 3 is provided with a convex block 10, the eccentric shaft connecting rod 9 is provided with a through hole 11 matched with the convex block 10, the convex block 10 is arranged in the through hole 11, and an axial position screw 12 is arranged on the outer end face of the convex block 10 to axially limit the eccentric shaft connecting rod 9. In the present embodiment, the bump 10 may be a D-shaped bump, a racetrack-shaped bump, a polygonal bump, or the like, and the through hole 11 is a D-shaped hole, a racetrack-shaped hole, a polygonal hole, or the like adapted to the shape of the bump 10. The combination of the above-mentioned projection 10 and through hole 11 can implement the synchronous rotation of eccentric shaft connecting rod 9 and eccentric shaft 3.

Further, the reset mechanism comprises a reset torsion spring 13 sleeved on the rod part of the shaft position screw 12, a limit screw 14 is screwed on the machine shell 1 on one side of the shaft position screw 12, a rotating arm at one end of the reset torsion spring 13 abuts against the limit screw 14, and a rotating arm at the other end of the reset torsion spring abuts against the side wall of the eccentric shaft connecting rod 9.

For the convenience of adjustment feed dog exposes the faller height, the utility model discloses the outer end cover of eccentric shaft 3 is equipped with limiting plate 15, be provided with arc hole 16 on the limiting plate 15, stop screw 14 passes arc hole 16 spiro union on casing 1, is provided with on limiting plate 15 of position of axle screw 12 for stop screw 14 opposite side and supports portion 17. In the initial state, that is, when no external force acts on the eccentric shaft link 9, the eccentric shaft link 9 abuts on the abutting portion 17 of the stopper plate 15 by the spring force of the return torsion spring 13.

The limiting plate 15 is fixed on the machine shell 1 through the shaft position screw 12, and the position of the eccentric shaft connecting rod 9 is limited by rotating the limiting plate 15, so that the function of adjusting the height of the cloth feeding teeth exposed out of the needle plate is achieved.

The utility model discloses a theory of operation is:

as shown in fig. 4, the arrow indicates the upward rotation of the presser foot lifting lever 2 and the rotation direction of the eccentric shaft connecting rod 9.

When the pressure raising and pressing foot function is used, the pressure raising and pressing foot lever 1 moves to contact the eccentric shaft connecting rod 9 which is fixed on the eccentric shaft 3 by using the shaft position screw 12, the eccentric shaft connecting rod 9 drives the eccentric shaft 3 to rotate, and the differential tooth rack 5 and the tooth rack assembly 6 which are fixed on the eccentric shaft 3 descend, so that when the pressure raising and pressing foot function is used, the differential tooth 7 and the tooth assembly 8 descend to the horizontal position of the needle plate.

The above-mentioned embodiment is only one of the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, so: all equivalent changes made according to the shape, structure and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. A feed dog elevating system which characterized in that: the eccentric shaft connecting rod (9) is driven by the pressure lifting foot lever (2) to rotate to drive the eccentric shaft (3) to rotate to drive the differential tooth (7) and the tooth component (8) to descend, and the eccentric shaft connecting rod (9) is driven by a reset mechanism to drive the reset differential tooth (7) and the tooth component (8) to reset.

2. The feed dog lifting mechanism according to claim 1, wherein: the outer end of the eccentric shaft (3) is provided with a convex block (10), a through hole (11) matched with the convex block (10) is formed in the eccentric shaft connecting rod (9), the convex block (10) is arranged in the through hole (11), and an axial position screw (12) is arranged on the outer end face of the convex block (10) to axially limit the eccentric shaft connecting rod (9).

3. A feed dog lifting mechanism according to claim 2, wherein: the convex blocks (10) are D-shaped convex blocks or track-shaped convex blocks or polygonal convex blocks, and the through holes (11) are D-shaped holes or track-shaped holes or polygonal holes.

4. A feed dog lifting mechanism according to claim 2, wherein: the reset mechanism comprises a reset torsion spring (13) sleeved on the rod part of the shaft position screw (12) and a limit screw (14) located on one side of the shaft position screw (12), the limit screw (14) is connected to the machine shell (1) in a threaded mode, a rotating arm at one end of the reset torsion spring (13) abuts against the limit screw (14), and the other end of the reset torsion spring abuts against the side wall of the eccentric shaft connecting rod (9).

5. The feed dog lifting mechanism according to claim 4, wherein: the outer end of the eccentric shaft (3) is sleeved with a limiting plate (15), an arc-shaped hole (16) is formed in the limiting plate (15), a limiting screw (14) penetrates through the arc-shaped hole (16) to be connected to the machine shell (1) in a threaded mode, and a propping portion (17) is arranged on the limiting plate (15) and opposite to the limiting screw (14).

6. A feed dog lifting mechanism according to any one of claims 1-5, characterized in that: the pressure raising and pressing foot lever (2) is controlled by a driver or a foot pedal to rotate.

7. The feed dog lifting mechanism according to claim 6, wherein: the driver is an electromagnet or a motor or a cylinder.

8. A sewing machine characterized by: comprising a feed dog lifting mechanism as claimed in any of claims 1-7.